Surgical Suction Nozzle

ABSTRACT

The present invention provides a surgical suction cannula capable of sucking a liquid component such as a small amount of blood while keeping an ability to suck a large clot such as a blood clot and to sweep them. The present invention relates to a surgical suction cannula, including: a tip opening capable of sucking a clot such as a blood clot; and a suction structure in the front of the tip opening. Due to the suction structure, the liquid component such as a small amount of blood can be sucked. Further, even when the tip opening is pressed against the vicinity of an organ, the suction structure interposed between a suction port and a surface of the organ prevents choke between the organ and the cannula or damage to the organ due to choke by suction. In addition, in a case of bleeding in a surgical site, the blood is sucked while controlling the bleeding by pressurizing a bleeding site, to thereby provide a view enabling a hemostatic site to be treated.

TECHNICAL FIELD

The present invention relates to a surgical suction cannula that sucksand removes blood, exuding body fluid, exfoliated small tissues andcleansing liquid during a surgical operation.

BACKGROUND ART

The suction of blood, cleansing liquid, and body fluid during a surgicaloperation is a very maneuver for ensuring a surgical view and isinvolved in the safety and precision of the surgical operation. Ingeneral, a surgical suction tube includes an elongated cylindricalsuction tube connected to a suction device of central piping and sucksblood flowing out to a surgical site and cleansing liquid by a cannulaat a tip end of the suction tube. There are disposable or reusablesurgical suction tubes, and most of the surgical suction tubes have atip opening that is several millimeters in size at a tip end. Further,the surgical suction tubes have a hole on a side wall, or have anoutside cap with a side hole to prevent suction of tissue. Thus, thesurgical suction tubes are devised so as to suck liquid componentseffectively.

The same cannula may be provided with a water injection valve at somemidpoint thereof so as to have a cleansing function or may also haveelectrical coagulation ability.

Further, in a brain surgery, the suction is conducted through a smallcotton sheet so that a brain tissue is not damaged by the suction. In alaparoscopic surgical operation, the suction needs to be conducted witha gauze cut to a small size inserted in some cases. In the case ofbleeding in which blood blows out from a blood vessel, a bleeding pointbecomes invisible immediately, which makes it necessary to conductastriction at the bleeding point simultaneously with the suction.However, the conventional suction accelerates the bleeding, which mayeven enlarge a bleeding hole.

If a suction port is limited to the tip opening, a soft organ, a greateromentum, and a blood clot adsorb to the tip opening during the suction,which hinders the suction. Therefore, in an abdominal surgicaloperation, the suction is conducted with an outer cylinder having alarge number of minute holes fitted to a side wall (Patent Literature 1). However, the greater omentum and the like are sucked by the minuteholes to close the holes, which makes it impossible to conduct effectivesuction and may also damage a sucked tissue. Further, when the side holeis opened, air enters from the side, and hence, a small amount ofremaining fluid and blood cannot be sucked. Then, there is a demand formeans for removing liquid components such as a small amount of remainingaccumulated fluid and a small amount of blood covering the surface of anorgan effectively without damaging the organ.

In particular, the laparoscopic surgical operation is performed withcarbon dioxide stored in an abdominal cavity. If the side hole is openedin the suction tube, a great amount of pressurized carbon dioxide issucked from the side, which eliminates the effect of gas enlarging theabdominal cavity. As a result, a view cannot be obtained. Further, inthe laparoscopic surgical operation, it is difficult to remove theentire blood that has been flown out by allowing a gauze to absorb theblood. Further, in the laparoscopic surgical operation, it is necessaryto finish the surgical operation without replacing a cannula frequently.Thus, there is a demand for means for removing liquid components such asa small amount of remaining blood and a small amount of bloody bodyfluid remaining on the surface of an organ effectively without damagingthe organ and sucking pressurized gas in the laparoscopic surgicaloperation.

In the case where there is further bleeding in a surgical site, it isnecessary to ensure a view enabling a hemostatic site to be treated bypressurizing a bleeding site while sucking blood to control thebleeding. There is a demand for means having a suction effectsimultaneously with bleeding control.

CITATION LIST Patent Literature

Patent Literature 1: Japanese Utility Model Application Laid-open No.Hei 7-22743

SUMMARY OF INVENTION Technical Problem

The present invention provides a surgical suction cannula capable ofsucking a liquid component such as a small amount of blood to present ableeding site without damaging an organ while keeping an ability to sucka large clot such as a blood clot.

Solution to Problem

The inventor of the present invention has intensively studied so as tosolve the above-mentioned problem, and found that the problem can besolved by a cannula having a suction structure to achieve the presentinvention.

That is, the present invention includes the following items:

1. A surgical suction cannula, including: a tip opening capable ofsucking a clot such as a blood clot; and a flexible suction structureextending in an axial front direction of a cannula from the tip opening.

2. A surgical suction cannula according to the above-mentioned item 1,in which the flexible suction structure is arranged at a tip openingtube wall of the surgical suction cannula.

3. A surgical suction cannula according to to the above-mentioned item 1or 2, in which the flexible suction structure is formed of a bristleand/or a protrusion.

4. A surgical suction cannula according to any one of to theabove-mentioned items 1 to 3, in which the flexible suction structureincludes a bristle structure including a plurality of bristles.

5. A surgical suction cannula according to any one of to theabove-mentioned items 1 to 4, in which the flexible suction structure isarranged along the tip opening tube wall.

6. A surgical suction cannula according to any one of to theabove-mentioned items 1 to 5, in which the flexible suction structureincludes a suction structure formed by packing a plurality of bristlesand/or protrusions, and in a cross-section of the tip opening of thesurgical suction cannula, a ratio of a cross-sectional area of thesuction structure to a cross-sectional area of the tip opening of thecannula is 5% to 60%.

7. A surgical suction cannula according to any one of to theabove-mentioned items 1 to 6, in which the flexible suction structureincludes a disposable suction structure connectable to and removablefrom a suction cannula body.

8. A surgical suction cannula according to any one of to theabove-mentioned items 1 to 7, in which a length from the tip opening toa tip end of the flexible suction structure is 0.2 times to 10 times adiameter of the tip opening.

9. A surgical suction cannula tip end unit, including a suctionstructure, the surgical suction cannula tip end unit being capable offorming the surgical suction cannula according to items 1 to 8 above bybeing connected to the suction cannula body.

10. A surgical suction cannula tip end unit according to theabove-mentioned item 9, including a suction structure and a cannula tipopening, in which the suction structure is arranged at a cannula tipopening tube wall.

11. A surgical treatment tool, including the surgical suction cannulaaccording to any one of items 1 to 8 above; and coagulation incisionmeans and/or cleansing means.

Advantageous Effects of Invention

The surgical cannula of the present invention is capable of collectingand sucking liquid components such as a small amount of blood and bodyfluid through a capillary action without choking the orifice whilekeeping the ability to suck a large clot such as a blood clot in an opensurgical operation or laparoscopic surgical operation. Further, thesurgical cannula is capable of sweeping as in a broom. Therefore, even ablood clot on the surface of an organ can be removed as if the bloodclot was wiped away while the surface is being cleansed so that theoriginal color of the organ can be recognized.

Further, even when the surgical cannula is pressed against an organ, thesuction structure interposed between the suction port and the surface ofthe organ hinders the adsorption, and thus, the effective suction offluid can be conducted smoothly and rapidly.

Further, the bleeding can be controlled by pressurizing a bleeding sitewith the suction structure. Simultaneously, blood can be sucked so thatthe blood is not accumulated, and hence, a bleeding point becomes clearand the effective hemostasis can be conducted.

In the suction in brain surgery, it is a contraindication to damage abrain tissue. The suction cannula of the invention of the presentapplication is capable of collecting blood and cleansing liquid in thesuction structure through a capillary action and an operation as in abroom and conducting the suction without bringing the suction cannulainto contact with the brain tissue, and is further capable ofcontrolling a bleeding site. Therefore, the surgical suction cannula ofthe invention of the present application is particularly effective inthe suction in the brain surgery.

BRIEF DESCRIPTION OF DRAWINGS

[FIG. 1] A view illustrating shapes and states of a surface of a bristleor a protrusion constituting a suction structure according to thepresent invention.

[FIG. 2] A perspective view of a tip end of a surgical suction cannulaaccording to Example 1.

[FIG. 3] A perspective view of a tip end of a surgical suction cannulaaccording to Example 2.

[FIG. 4] A perspective view of a tip end of a surgical suction cannulaaccording to Example 3.

[FIG. 5] A perspective view of a tip end of a surgical suction cannulaaccording to one embodiment of the present invention.

[FIG. 6] A perspective view of a tip end of a surgical suction cannulaaccording to another embodiment of the present invention.

[FIG. 7] A perspective view of a tip end of a surgical suction cannulaaccording to a further embodiment of the present invention.

[FIG. 8] A perspective view of a tip end of a surgical suction cannulaaccording to a still further embodiment of the present invention.

[FIG. 9] A perspective view of a tip end of a surgical suction cannulaaccording to a yet further embodiment of the present invention.

[FIG. 10] A perspective view of a tip end unit for a surgical suctioncannula according to one embodiment of the present invention.

[FIG. 11] A use example of the surgical suction cannula of the presentinvention, illustrating that liquid components such as a small amount ofblood and body fluid remaining on a surface of an organ can also besucked.

[FIG. 12] A use example of the surgical suction cannula of the presentinvention, illustrating that liquid components such as a small amount ofblood and body fluid remaining at a narrow site can be suckedcompletely.

DESCRIPTION OF EMBODIMENTS

The invention of the present application relates to a surgical suctioncannula, including: a tip opening capable of sucking a clot such as ablood clot; and a flexible suction structure extending in an axial frontdirection of a cannula from the tip opening.

Herein, the tip opening refers to an opening of a tip end portion of thecannula that sucks blood, body fluid, and cleansing liquid caused duringa surgical operation in the surgical suction cannula, and the axialfront direction of the cannula from the tip opening refers to a furtherfront direction from the vicinity of the tip opening. The surgicalsuction cannula of the invention of the present application has aflexible suction structure that extends in the axial front direction ofthe cannula from the tip opening, and the tip opening keeps an abilityto suck a clot such as a blood clot.

The suction structure according to the invention of the presentapplication is a flexible structure that is formed of a plurality ofbristles and/or protrusions. Examples of the suction structure include abristle structure formed of a plurality of bristles, a protrusionstructure formed of a plurality of flexible protrusions, and a structureformed of a plurality of bristles and a plurality of protrusions.

The suction structure used in the present invention causes a capillaryaction. The bristles and protrusions are not so hard as to damage anorgan, have elasticity and resilience, return to the original shapeseven after being pressurized, are not too soft, and have elasticity andhardness to such a degree that the bristles and protrusions are notsucked by a suction port. It is preferred that the suction structurehave a function of alleviating the contact between a tissue and acannula opening in suction during a surgical operation andsimultaneously achieve sufficient suction. The suction structure cansuck liquid components such as a small amount of blood through acapillary action of the suction structure and can simultaneously performan operation of sweeping as in a broom. On the other hand, when thesuction structure is dense and has elasticity, the suction structure cancontrol the bleeding by pressurizing a point at a time of bleeding, andcan simultaneously suck blood in such a manner that the blood is notaccumulated. Further, even if the tip opening is pressed against thevicinity of an organ, the suction structure is interposed between thesuction port and the surface of the organ to prevent the choke betweenthe organ and the cannula or damage to the organ due to the choke bysuction.

It is preferred that the suction structure of the cannula of the presentinvention be shaped so as not to damage an organ, have softness andelasticity, and have a tip end which is thin and bent smoothly. Further,in order to allow the cannula to proceed to a target site in thelaparoscopic surgical operation, it is preferred that the tip end of thesuction structure be thin as a whole.

The bristle and protrusion may have one root and be branched at aperiphery. Further, the bristle and protrusion may have a narrow tubeshape, a twining shape, a network shape, a twisted yarn shape, a knittedyarn shape, a nonwoven fabric shape, or a plate shape.

Further, although the surface of the bristle and the protrusion may besmooth, the surface of the bristle and the protrusion may be providedwith unevenness or grooves so as to cause a capillary action easily. Forexample, the bristle and the protrusion may be provided with verticalgrooves, cracks, or grooves in a matrix.

It is preferred that the shape of the bristle or the protrusion close toa tip end thereof be tapered. Further, it is suitable that the tip endbe rounded.

The cross-section of the bristle may be circular or non-circular withoutany limit, and the diameter of the cross-section in the case where thebristle is circular is preferably 0.001 to 1 mm, more preferably 0.005to 0.5 mm, still more preferably 0.01 to 0.2 mm, most preferably 0.05 to0.15 mm. The suitable thickness of the bristle varies depending upon anorgan for which the bristle is used and a purpose of use.

The cross-section of the protrusion may be circular or non-circularwithout any limit, and the diameter of the cross-section in the casewhere the protrusion is circular is preferably 0.1 to 1 mm, morepreferably 0.3 to 0.8 mm. In the case where the protrusion is oval, thepreferred long diameter thereof is 0.1 to 1 mm, and the preferred shortdiameter thereof is 0.001 to 0.5 mm. The suitable thickness of theprotrusion varies depending upon a material to be used, an organ forwhich the protrusion is used, and a purpose of use.

In the case of a thick bristle or protrusion, it is preferred that thebristle or protrusion be devised so as to be provided with unevenness orgrooves on the surface or so as to have a knitted yarn shape or atwisted yarn shape.

Regarding the length of the suction structure of the cannula of thepresent invention, the length from the tip opening to the tip end of thesuction structure is preferably 0.2 to 10 times, more preferably 0.5 to5 times the diameter of the tip opening. That length is preferably 2 mmto 30 mm, more preferably 2 mm to 20 mm, still more preferably 5 mm to15 mm. If the length is smaller than the length that is 0.2 times thediameter of the tip opening, the effect of protecting a tissue and thelike is insufficient, and the effect of removing a small amount ofliquid components in a narrow portion is insufficient. If the length islarger than the length that is 10 times the diameter of the tip opening,the effect of suction is degraded, with the result that the suctionstructure hinders the surgical operation. Although the small length ofthe suction structure is unsuitable for the protection of a tissue, thesuction structure has an advantage of keeping the suction force, and thesuitable length and hardness vary depending upon an organ for which thesuction structure is used and a purpose of use.

It is preferred that the number and density of bristles or protrusionsconstituting the suction structure of the cannula of the presentinvention be set to form such an assembly as to exhibit the sufficienteffect of a capillary action. Further, it is preferred that the numberand density of bristles or protrusions be set to form such an assemblyas to prevent the adhesion between an organ and the cannula or damage tothe organ due to the adhesion by suction. Further, it is preferred thatthe number and density of bristles or protrusions be set to form such anassembly as to control bleeding.

The surgical suction cannula of the invention of the present applicationhas a tip opening capable of sucking a clot such as a blood clot. Havinga tip opening capable of sucking a clot such as a blood clot refers tohaving an opening with such a size as to suck not only liquid blood,cleansing liquid, and the like, but also a clot such as a blood clot.

In the surgical suction cannula of a preferred embodiment of theinvention of the present application, the suction structure is arrangedon a tip opening tube wall of the suction cannula. Examples of thearrangement position include an inner side, a tip end, and an outer sideof the tip opening tube wall.

In the surgical suction cannula of one embodiment of the invention ofthe present application, the suction structure is arranged along the tipopening tube wall. The arrangement position and arrangement method arenot limited. For example, the suction structure may be arranged at thetip end of the opening tube wall, or may be arranged along the outerside or inner side of the tube wall.

The suction structure is arranged along a part or all of the tip openingtube wall of the cannula. Depending upon the purpose, the bristles orprotrusions are arranged along 5% to 100%, preferably 10% to 100%, morepreferably 15% to 100% of the circumference of the opening tube wall.Depending upon an organ and a purpose of use, the bristles orprotrusions are arranged along preferably 10% to 80%, more preferably15% to 60%, still more preferably 20% to 50% of the circumference.

The suitable arrangement ratio of the suction structure varies dependingupon an organ and a purpose of use. In the case of brain surgery inwhich it is a contraindication to damage an organ by suction and asuction amount is small, the suction structure may be arranged aroundthe opening. In the case where it is required to suck a great amount ofliquid components, the suction structure may be arranged so as toinhibit the adsorption with respect to an organ even if a capillaryaction may not be realized. In the case where the suction structure isarranged partially, it is suitable that the suction structure bearranged along the opening tube wall on a lower side (side on whichthere is a possibility of the contact with a tissue and the like) of thecannula. If the suction structure is arranged along 5% or less of thecircumference, it becomes difficult to achieve the effect of targetsuction, the effect of protecting a tissue, and the effect ofhemostasis.

In the case where the bristles or protrusions are arranged along the tipopening tube wall, the bristles or protrusions may be arranged one byone, or may be arranged on the basis of a plurality of the bristles orprotrusions. Further, the bristles or protrusions may be arranged inone, two, three, or more lines.

In another embodiment of the present invention, the suction structureformed by packing a plurality of bristles and/or protrusions is arrangedin an inner portion of the cannula, an outer portion thereof, or at atip end of the tube wall. In the case of any arrangement, the suctionstructure is suitably arranged on a lower side (side on which there is apossibility of the contact with a tissue and the like) of the cannula.

In the case where the suction structure formed by packing a plurality ofbristles and/or protrusions is present in an inner portion of the tipopening, the ratio of the cross-sectional area of the suction structurewith respect to the cross-sectional area of the tip opening of thecannula is preferably 5% to 60%, more preferably 10% to 60%, still morepreferably 15% to 45%, yet more preferably 20% to 40%. By setting thecross-sectional area of the suction structure to be 60% or less, anopening can be ensured, which is capable of sucking a clot such as ablood clot.

In the case where the suction structure formed by packing a plurality ofbristles and/or protrusions is arranged in an outer portion of thecannula or arranged at a tip end of the tube wall, the tip opening isensured as an opening. It is preferred that the amount of the suctionstructure be equal to that in the case where the suction structure isarranged in an inner portion of the cannula.

In the case where the suction structure has a configuration in which aplurality of bristles and/or protrusions are packed, the specific numberof the bristles and/or protrusions is about 10 to 500. The number ischanged depending upon the thickness and shape of the bristles and/orprotrusions, a purpose, and an organ in a surgical site.

The material for the cannula of the present invention is notparticularly limited, and a generally used one may be used. For example,a metal material such as stainless steel, a titanium alloy, duralumin,or aluminum or a resin material such as a nylon resin, an ABS resin, apolycarbonate resin, or saturated propylene may be used. A compositematerial of a metal material and a resin material may also be used.

It is preferred that the material for bristles or protrusions of thesuction structure of the present invention be soft and do not damage anorgan. However, there is no particular limitation to the material, aslong as the material has flexibility and elasticity, bends smoothly, andhas resilience. For example, natural fibers, natural hair, artificialfibers, artificial hair, plastic, nylon, vinylon, saturated propylene,and the like can be used. Those which are generally used for atoothbrush may be used.

In order to prevent the suction structure from coming off from thecannula, the material for the cannula may be set to be the same as thatfor the suction structure. It is preferred that the suction structurecan be molded integrally with the tube wall of the cannula.

The suction structure can be formed of a thin hollow yarn. In the casewhere the suction structure is arranged in an inner portion of thecannula, liquid components such as blood and body fluid can be sucked bythe suction through the cannula, and hence, the hollow yarn may or maynot be connected to a central suction cleansing device. The effect ofsucking liquid components is further enhanced by the ability to suckthrough the tip opening and the hollow yarn. It is preferred that thehollow yarn be connected to the central suction cleansing device, and inthis case, it is preferred that the suction be divided into the suctionby the suction structure and the suction by the tip opening. By dividingthe suction, the operation and adjustment of the suction and cleansingcan be performed individually in the hollow yarn portion and the tipopening.

It is preferred that the surgical suction cannula of the presentinvention does not have a hole on the side wall of the cannula forsucking a small amount of fluid. If the side hole is opened, air entersfrom the side, which makes it difficult to suck a small amount ofremaining fluid and blood. Particularly in the laparoscopic surgicaloperation, if the side hole is opened, air and the like enter from theside to eliminate the effect of enlarging an abdominal cavity by the gaspressurization.

A thick suction tube having a hole on a side wall is preferred forcleansing (about 1 to 10 L are used) during the abdominal surgicaloperation. In this case, only the effect that the suction tube does notadhere to a tissue suffices, and preferably, the suction structure maybe provided outside of the side hole.

The suction structure is fixed to the tip opening of the cannula or theperiphery thereof. Although there is no particular limitation to thefixing method, the suction structure can be fixed by weld joining,adhesion joining, integral molding, bondage, or the like.

The suction structure, or the tip opening or the periphery thereof towhich the suction structure is fixed may be removable from the suctioncannula body.

Because it is difficult to cleanse and disinfect the suction structureof the invention of the present application after the use, it ispreferred that the suction structure be disposable. If the suctioncannula body is reusable, only the suction structure maybe disposable.The tip opening of the suction cannula may also be disposable. Further,the tip opening and the suction structure may be molded integrally.

At a time of use, the suction structure is connected to the suctioncannula body. It is preferred that the suction structure be attached tothe suction cannula by one-touch attachment through a cassette-shapedattachment unit. The suction structure may be attached to the suctioncannula through a screw, fitting, an elastic band, or the like. Thesuction cannula itself may be disposable.

The present invention also includes a surgical suction cannula includinga reusable suction cannula and a disposable suction structure attachedremovably to the tip end of the suction cannula.

The cannula of the present invention may have an outer cylinder. Theouter cylinder is suitable for allowing the cannula of the presentinvention to proceed to a target site in the laparoscopic surgicaloperation. Further, the cannula of the present invention may havefunctions other than the suction. Examples of the functions include acleansing function and a coagulation ability with an electromagneticwave. For example, in the case where the surgical suction cannula of theinvention of the present application is connected to cleansing means,the surgical suction cannula has a cleansing function. In the case wherethe surgical suction cannula is connected to coagulation incision means,the coagulation incision means can be extended to a surgical site froman inner portion or an outer portion of the cannula of the presentinvention.

Further, the surgical suction cannula of the present invention can beused together with the coagulation incision means and/or cleansing meansfor a living tissue. Further, the present invention provides a surgicaltreatment tool in which the surgical suction cannula, and thecoagulation incision means and/or the cleansing means are integrated.Examples of the tool include a surgical treatment tool in which thecoagulation incision means and/or the cleansing means are providedoutside of the suction cannula of the present invention, and a surgicaltreatment tool including the suction cannula of the present invention,and the coagulation incision means and/or the cleansing means in theouter cylinder. The treatment tools provided with these means enable asurgical operation to be performed precisely and easily. An example ofthe coagulation incision means is means for cutting a tissue aftercoagulating the tissue with an electromagnetic wave.

The present invention further relates to a surgical suction cannula tipend unit including a suction structure connectable to the surgicalsuction cannula body. The surgical suction cannula tip end unit includesa cannula connecting portion and a suction structure. The surgicalsuction cannula tip end unit may further include a surgical suctioncannula tip opening. It is preferred that the tip opening and thesuction structure be made of the same material or be molded integrally.

It is preferred that the suction cannula tip end unit be disposable.When the suction cannula tip end unit of the present invention isconnected to the surgical suction cannula body, the suction cannula tipend unit includes a surgical structure capable of forming the suctioncannula of the present invention.

The tip end unit is connected to the surgical suction cannula bodythrough a screw, fitting, an elastic band, or the like. It is preferredthat the tip end unit be connected to the surgical suction cannula bodyby one-touch attachment through a cassette-shaped attachment unit or anelastic band.

Hereinafter, examples of the present invention are described withreference to the drawings.

EXAMPLE 1

FIG. 2 illustrates a surgical suction cannula of this example. Thesurgical suction cannula of this example includes a cylindrical suctioncannula body portion 1 and a suction structure 2 formed of bristlesarranged at the tip end of the suction cannula body portion 1. Thesuction structure was integrally molded with a 30% portion of thecircumference of a tip opening 3 of a cannula. The length from theopening of the cannula to the tip end of the suction structure is 2.2times (1.1 cm) the outer diameter of the tip opening. The tip endportion of the suction structure is thinned as a whole. The bristles aremade of a nylon material, and the thickness thereof is 100 μm indiameter. The vicinity of the tip end of the bristles is tapered, andthe tip end portion has a semi-spherical shape. When the cannula havingthe suction structure was lightly pressed against the surface of anorgan of a dog and liquid components were sucked as if the liquidcomponents were swept, a small amount of the liquid components on thesurface of the organ was sucked without the surface of the organadhering to the cannula. Further, when the cannula was pressed againstthe small amount of the liquid components remaining in a small dent andthe liquid components were sucked, the small amount of the liquidcomponents was sucked without the cannula adhering to the organ.

EXAMPLE 2

FIG. 3 illustrates a surgical suction cannula of this example. Thesurgical suction cannula has the same shape and material as those of thesuction cannula of Example 1, except that the surgical suction cannulais obtained by weld-joining the suction structure to an outer portion ofthe tip opening tube wall of the cannula. When the effect of the cannulahaving this suction structure was checked in the same way as in Example1, the satisfactory results were obtained in the same way as in Example1.

EXAMPLE 3

FIG. 4 illustrates a surgical suction cannula of this example. Thesurgical suction cannula of this example includes a cylindrical suctioncannula body portion 1. A suction structure 2 is present in a lowerportion inside the suction cannula body and the suction structureextends forward from inside of a tip opening 3. The suction structure isformed of a hollow yarn 4, and the suction is divided into the suctionby the tip opening and the suction by the hollow yarn. A suction passageby the tip opening and the suction structure formed of the hollow yarnare separated from each other by a partition wall 8 inside the cannula .The hollow yarn is connected to a central suction cleansing device andis capable of sucking liquid components such as blood and body fluidindependently from the tip opening. If the hollow yarn is stuck, thehollow yarn is capable of sucking the liquid components after cleansing.The hollow yarn is fixed to an inner side of the suction cannula bodythrough adhesion joining. The hollow yarn occupies 35% of thecross-sectional area of the tip opening. The length from the tip openingto the tip end of the hollow yarn is twice (1.0 cm) the outer diameterof the tip opening. The bristles are made of a nylon material, and thethickness thereof is 500 μm in diameter and 400 μm in inner diameter.When the cannula having the suction structure was pressed against thesurface of an organ of a dog and liquid components were sucked, theliquid components were sucked without the surface of the organ adheringto the cannula. Further, when the small amount of the liquid componentsremaining in a small dent was sucked, the small amount of the liquidcomponents was sucked without damaging the organ.

REFERENCE SIGNS LIST

1 cylindrical suction cannula body

2 suction structure

3 tip opening

4 hollow yarn

5 organ

6 liquid component such as blood and body fluid

7 narrow portion in surgical site

8 partition wall inside cannula

1-11. (canceled)
 12. A surgical suction cannula, comprising: a tipopening that is capable of sucking a clot; and a flexible suctionstructure comprising an extended bristle in an axial front direction ofa cannula from the tip opening.
 13. The surgical suction cannulaaccording to claim 12, wherein said flexible suction structure islocated at a tube wall of said tip opening.
 14. The surgical suctioncannula according to claim 12, wherein said flexible suction structureis formed of an elastic bristle, a protrusion, or a combination thereof.15. The surgical suction cannula according to claim 12, wherein saidflexible suction structure comprises a bristle structure.
 16. Thesurgical suction cannula according to claim 15, wherein said flexiblesuction structure comprises a plurality of said bristles.
 17. Thesurgical suction cannula according to claim 12, wherein said flexiblesuction structure is arranged along said tip opening tube wall.
 18. Thesurgical suction cannula according to claim 12, wherein said flexiblesuction structure comprises a suction structure formed by packing aplurality of bristles, protrusions, or a combination thereof and in across-section of said tip opening of said surgical suction cannula. 19.The surgical suction cannula according to claim 18, wherein a ratio of across-sectional area of said flexible suction structure to across-sectional area of said tip opening of said cannula ranges from 5%to 60%.
 20. The surgical suction cannula according to claim 12, whereinsaid flexible suction structure comprises a disposable suction structurethat is removably attached to a suction cannula body.
 21. The surgicalsuction cannula according to claim 12, wherein a length from said tipopening to a tip end of said flexible suction structure ranges from 0.2times to 10 times a diameter of said tip opening.
 22. A surgical suctioncannula tip end unit, comprising a suction structure, wherein when saidsurgical suction cannula tip end unit is connected to a suction cannulabody forms the surgical suction cannula of claim
 12. 23. The surgicalsuction cannula tip end unit of claim 22 further comprising a suctionstructure and a cannula tip opening, wherein said suction structure islocated at a tube wall of said cannula tip opening.
 24. A surgical tool,comprising: the surgical suction cannula of claim 12; and a coagulationincision means, a coagulation cleansing means, or a combination thereof.